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• W2893865349 abstract "Abstract This paper describes a technique of making carbonate by rapid CO2 capture from groundwater for direct measurement of the 14C content by accelerator mass spectrometry (AMS). The DIC in groundwater was extracted from acidified water in the form of carbon dioxide (CO2), and transferred into saturated barium hydroxide solution to form barium carbonate (BaCO3). After the BaCO3 precipitate was freeze-dried, it was mixed with a metal powder and pressed into an AMS target for measurement. The behaviors of Si, Al, Fe and Ta powder as the binder with carbonate were evaluated. The C3+ currents from carbonate targets mixed with Fe or Ta were found generally larger than those with Si or Al by a factor of two. The baked Ta was shown to produce fewer contaminating 14C counts than all the others, with or without baking. The CaCO3/Ta and BaCO3/Ta mass mixing ratios in the range from 1:2 to 1:4 and in 1:1.5, respectively, produced optimized currents. The precision and accuracy of the measurement by direct CaCO3 or BaCO3 sputtering using Ta as the binder, were evaluated in comparison to a selected reference material. The agreement was reasonably good between the direct carbonate measurement and the high precision measurement through combustion and graphitization. These findings support the further development of a rapid assessment method directly from field work to measurement." @default.
• W2893865349 created "2018-10-05" @default.
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• W2893865349 date "2018-12-01" @default.
• W2893865349 modified "2023-10-17" @default.
• W2893865349 title "BaCO3 targets produced from dissolved carbonate in groundwater for direct AMS measurement" @default.
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• W2893865349 doi "https://doi.org/10.1016/j.nimb.2018.09.026" @default.
• W2893865349 hasPublicationYear "2018" @default.
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